Power-hammer.



8. P. HARVEY.

POWER HAMMER.

APPLICATION HLBD MBA, 1912.

1,045,548. Patented Nov. 26, 1912.

SILAS P. HARVEY, OF BIGTIMBER, MONTANA.

I'OWER-HAMMER.

Specification of Letters' Patent.

Patented Nov. 26, 1912.

AppIication filed. April 4, 1912. Serial No. 688,510.

To a'ZZ whom it may concern:

Be it known that I, SILAs P. HARVEY, a citizen of the United States, residing at Bigtimber, in the county of Sweet Grass and State of Montana, have invented a new and useful Tmprovement in Power-Hammers, o-f which the following is a specification.

My invention relates particularly to that class of power-hammers in which a bowspring is interposed between the hammer and the pitman or other driving mechanism of the machine; and my primary object is to provide simplified and durable adjust-ing devices connecting` the ends of the bowspring with the hammer, whereby the spring tension may be accurately and reliably adjusted, thus enabling the blows of the hammer to be suited with nicety to the character of the work.

A further object is to provide means of the characterindicated adapted to be readily employed in connect-ion with machines of different makes, but of the same general type. The invention is calculated, moreover, to increase the life of the machine to which it is applied.

The invention is illustrated in its preferred embodiment in the accompanying drawings, in which- Figure 1 represents a broken front elevational view of a power-hammer constructed in accordance with my invention; and Fig. 2, a broken horizontal sectional view on an enlarged scale, the view being taken as indicated at line 2 of Fig. 1.

ln the construction illustrated, A represents the frame of a machine equipped with a hammer-guide A' and the anvil A2; B, a how-spring actuated by any suitable means; O, a hammer which is vertically reciprocable in the guide A'; and D, D my improved adjusting devices interposed between the ends of the how-spring and the hammer C.

The frame A may be of any suitable construction. The how-spring B may begiven a Vertical movement by any suitable actuating means. The actuating means shown comprises a driving shaft 1 on which is mounted a wheel 2 carrying a wrist-pin 3 which is joined by a pitman 4 to the upbowed central portion of the spring B.

In the illustration given, the hammer stock is shown provided with pivot-bearings having removable sections 5. Each'device D comprises a yoke-form member whose web portion afords a pivot 6 and whose arms 7 are substantially parallel with each other; and a pivot Sz adjustable in slots 9 with which thev arms 7 are provided near their outer ends, the pivot 8 being capable of adjustment through the medium of setscrews 10.

The 'pivo-t 6 which is formed integrally with the arms 7 is connected with the corresponding pivot-bearing of the hammer, the section 5 of the bearing being made removable to facilitate the connection. The hammer may be provided with any other form of bearing adapted to receive the pivot 6, however. The pivot 8 preferably comprises a bolt having a head 11 and a nut 12 against which theset-screws 10 impinge. The set-screws, or adjusting screws, 10, have threaded connections with out-turned lugs 13 with which the arms 7 are provided at their outer ends. Lock-nuts 14 are provided for securing the set-screws firmly in the lugs 13 after the set-screws are adjusted. The bolt 8 passes through a pivot bearing 15 with which the extremity of the how-spring is provided. It will now be understood that the how-spring may be placed under the required tension by adjusting the set-screws 10. The spring, of course, maintains the heads 11 and nuts 12 of the bolts 8 firmly in contact with the inner ends of the adjusting screws under all conditions. Thus, no lock-nuts are necessary on the bolts. 8, since it is impossible for either the bolts or nuts to turn, owing to the engagement of the bolt-heads and the nuts by the inner ends of the screws 10. It will be understood that the construction affords very substantial bearings between the devices D, the hammer, and the extremities of the how-spring. Moreover, the most accurate adjustment can be made, since the screws 10 are independently adjustable, enabling a differential adjustment of each bolt 8 to be obtained. Obviously, the adjustments are reliable, and the construction is thoroughly durable.

In the operation of the machine, the rotation of shaft 1 is effected and Controlled by any suitable means (not shown). As the shaft 1 rotates, the hammer is reciprocated through the medium of the bow-spring B and the connecting devices D. The hammer may descend, under its own momentum, a greater distance than that due to the throw of the wrist-pin 8, the fiexure of the spring permitting such action. On the other hand, when the throw of the wristpin is greater than the movementV of the 55 hammer, the spring yields to compensate i been given for clearness of understanding,

and no undue limitation should be understood therefrom.

What I regard as new and desire to secure by Letters Patent is:

1. In a power-hammer, the combination with a bow-spring, actuating means therefor, and a hammer, of connecting devices between the ends of the spring and the hammer, each `connecting device comprising a yoke-form member having a web-portion affording a pivot, and a second pivot adjustably connected'with the arms of said yoke-form member, one of said pivots being connected with the hammer and the other with the corresponding end of the how-spring.

2. ln a power-hammer, the combination with a bow-spring, actuatingmeans therefor, and a hammer, of a connecting device between the hammer and the extremity of the how-spring, comprising a yoke-form member having a web-portion pivotally connected Wit-h the hammer and having arms provided with slots, a pivot joined to the extremity of the spring and movable in said slots, and adjusting screws connected with Vthe extremities of said arms, for the purpose set forth.

3. In a power-hammer, the combination with a bow-spring, actuating means therefor, and a hammer, of a connecting device between the hammer and the extremity of the how-spring, comprising a yoke-form member having a web-portion pivotallyi connected with the hammer and having arms provided with slots, a pivot-bolt extending through said slots and engaging a bearing at the extremity of the sprlng, and adj usting screws eXtending through out-turned lugs at the extremities of said arms and bearing at their inner ends against the head and nut of said pivot-bolt.

4. A spring-adjusting device of the character set forth, comprising a yoke-form member having a pivot-portion and parallel arms extending therefrom which are provided with sle-ts and have out-turned eX- tremities provided with threaded perforations, a pivot bolt extending through said slots, and adjusting screws extending through said threaded perforations and engaging the head and nut of said pivot bolt.

SILAS P. HARVEY.

In the presence of- J AMES STIOKLEY, JOHN S. SOLBERG.

Cope of this patent may be obtained for` five cents each, by addressing the Commissioner of Patents, Washington, ID. O." 

